JPH0512696A - Optical disk device - Google Patents

Abstract

PURPOSE:To provide a stable control operation even though the sliding region is large by using a bent and flexible printed wiring board which has a plane parallel to the main axis and a plane perpendicular to the main axis. CONSTITUTION:A hollow axis 2 is set standing on a base 3 and a transmission hole 2 is provided internal to the axis to have an optical path. A movable and turning member 4, which is being held and is movable and turnable against the hollow axis 2, is placed and a condenser lens 5 and a flexible printed wiring board 11 are provided. And, the flexible printed wiring board 11 has a plane 11a which is approximately parallel to the hollow axis 2 and a plane 11b which is approximately perpendicular to the hollow axis 2 and 11a and 11b are connected by bending. Furthermore, one side of the flexible printed wiring board 11 are connected to the ends of coil winding of a tracking driving coil 9 and a focusing driving coil 10 on the movable and rotatable member 4 and the other end is connected to a power supply section holding base 12 located on the base 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft-sliding optical disk device used for an external storage device such as a computer.

[0002]

2. Description of the Related Art Conventionally, many optical disk devices using a shaft sliding type optical pickup have been used.

An optical disk device using a conventional shaft sliding type optical pickup will be described below.

FIG. 4 is an exploded perspective view of a conventional optical disk device. The condenser lens 13 for condensing the laser light is held by a holder 14 which is a moving / rotating member, and a main shaft 16 is fixed to the base 15 in parallel with the optical axis of the condenser lens 13. It is supported so that it can slide and rotate freely. The focus drive coil 17 is wound around the outer peripheral surface of the holder 14 and
A pair of tracking drive coils 18 at two locations on the outer peripheral surface of the
a and 18b are attached. The focus drive coil 17 and the tracking drive coils 18a and 18b
Further, the corresponding focusing permanent magnet 19 and tracking permanent magnets 20a and 20b are respectively provided upright on the base 15. The focusing permanent magnet 19 constitutes a magnetic circuit together with the yoke 21 erected on the base 15. The tracking drive coils 18a and 18b have a rectangular spiral shape having four sides. When an electric current is applied to the tracking drive coils 18a and 18b, a tracking rotation force is generated in a direction indicated by an arrow A. According to the law, what is effective for this turning force is one side (effective portion) parallel to the axis of the spindle 16 of the tracking drive coils 18a and 18b, and the remaining one side (ineffective portion) parallel to the axis of the spindle 16 is effective. Since the direction of current flow is opposite to that of one side of the portion, the holder 4 is rotated within a range in which the sides of the effective portion and the ineffective portion are not simultaneously subjected to the magnetic action of the tracking permanent magnets 20a and 20b. Further, when a current is applied to the focus drive coil 17,
Due to the magnetic action of the focusing permanent magnet 19 and the yoke 21, the focus driving force is applied in the direction indicated by the arrow B according to Fleming's left-hand rule. Reference numeral 22 is a coil power supply board that supplies power to the focus drive coil 17 and the tracking drive coils 18a and 18b, and 23 is a coil clamper provided on the coil power supply board 22. Focus drive coil 17 and tracking drive coil 18
The ends of a and 18b are provided with a slack so that they do not become a resistance when the holder 14 operates in the focus direction and the tracking direction, are supported by the coil clamper 23, and then are fixedly connected to the coil power supply substrate 22 by wire connection.

[0005]

However, in the above-mentioned conventional optical disk device, the tracking drive coil 17 is used.
It is necessary to perform lead wire processing in which a part of the focus driving coils 18a and 18b is drawn out as a lead wire and is fixed to the coil power supply substrate 22 provided on the base 15, but the rotation range of the holder 14 due to the tracking operation is large. In this case, there is a problem that the lead wire is likely to be disconnected and the lead wire becomes inoperable. Further, when the holder 14 performs an operation in the tracking direction, due to the resistance caused by the deformation of the lead wire, the spindle 1 is separated by the gap between the spindle 16 and the holder 14.
6 has a problem in that it does not maintain the position accuracy and stable control operation in the tracking direction cannot be obtained.

[0006]

In order to solve the above problems, the present invention provides a flexible printed wiring board for supplying power to at least one of a focus drive coil and a tracking drive coil, and a flexible printed wiring board held by a base. A flexible printed wiring board has a surface that is substantially parallel to the main axis and a surface that is substantially perpendicular to the main axis, and has a curved and bent shape.

[0007]

According to the above construction, the tracking drive coil and the focus drive coil attached to the holder which is the movable portion and the coil power supply substrate which is the fixed portion can be easily connected, and the disconnection does not occur. Further, when the holder is largely moved in the focus direction, a plane substantially perpendicular to the main axis of the flexible printed wiring board bends, and when it is largely rotated in the tracking direction, a plane almost parallel to the main axis of the flexible printed wiring board is bent. Because of the bending, the deformation resistance of the flexible printed wiring board is suppressed to an extremely small value, the influence on the operation of the holder is small, and the control operation of the holder can be stably performed.

[0008]

1 is an exploded perspective view of an optical disk device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is an optical disk having an innermost track 1a and an outermost track 1b, and 2 is a hollow shaft which is a main shaft erected on a base 3 of the optical disk device. The hollow shaft 2 has a transmission hole 2a forming an optical path inside, and an outer periphery 2b is polished and coated with Teflon resin or the like. A hollow shaft 2 is movably and rotatably supported, and 4 is moved along the axis Z in the focus direction indicated by the arrow F and is rotated around the axis Z in the tracking direction indicated by the arrow R, and further separated from the axis Z. It is a moving / rotating member which holds the condenser lens 5 at a different position and is made of a non-magnetic material. 6 is a center yoke made of a ferromagnetic material arranged concentrically with the hollow shaft 2, and 7 is a side yoke made of a ferromagnetic material concentric with the hollow shaft 2 and arranged so as to face the center yoke 6. Is. Reference numeral 8 is a permanent magnet fixed to the side yoke 7 so as to form a magnetic circuit together with the center yoke 6 and the side yoke 7. Further, a pair of rectangular air-core tracking drive coils 9 around which the center yoke 6 is wound and a focus drive coil 10 concentric with the hollow shaft 2 are attached to the moving / rotating member 4. One side of the tracking drive coil 9 and a part of the focus drive coil 10 are located in a space forming a part of a magnetic circuit generated between the center yoke 6 and the side yoke 7. Reference numeral 11 denotes a flexible printed wiring board which has a curved shape surrounding the moving and rotating member 4.
The flexible printed wiring board 11 has a surface 11a substantially parallel to the hollow shaft 2 and a surface 11b substantially perpendicular to the hollow shaft 2, and the surfaces 11a and 11b are connected by bending. One end of the flexible printed wiring board 11 is fixedly connected to the ends of the coil wires of the tracking drive coil 9 and the focus drive coil 10 on the moving and rotating member 4, and the other end of the flexible printed wiring board 11 is provided on the base 3 to supply power. It is fixedly connected to the part support base 12.

FIG. 2 is a plan view showing a deformed state of the flexible printed wiring board 11 during the tracking operation. Figure 2
2A and 2B respectively show the position of the condenser lens 5 when the moving and rotating member 4 accesses the innermost track 1a and the outermost track 1b. During the tracking operation, the surface 11a that is substantially parallel to the main axis of the flexible printed wiring board 11 bends, so the deformation resistance of the flexible printed wiring board 11 is extremely small.

FIG. 3 is a side view showing a deformed state of the flexible printed wiring board 11 during the focusing operation. Figure 3
3A shows a state where the optical disc board 1 is separated from the base 3, and FIG. 3C shows a state where the optical disc board 1 is close to the base 3.
FIG. 3 (b) shows an intermediate state between FIG. 3 (a) and FIG. 3 (b). Since the surface 11b of the flexible printed wiring board 11 that is substantially parallel to the hollow shaft 2 is bent during the focusing operation, the deformation resistance of the flexible printed wiring board 11 is extremely small.

[0011]

As described above, according to the present invention, the flexible printed wiring board that supplies power to at least one of the focus driving coil and the tracking driving coil, and the base that is held by the base and supports the flexible printed wiring board. The flexible printed wiring board has a surface parallel to the main axis and a surface perpendicular to the main axis, and has a curved and bent shape, and is attached to a movable rotating member that is a movable part. A tracking drive coil and a focus drive coil,
The base, which is the fixed part, can be easily connected, and disconnection does not occur. Further, when the holder is largely moved in the focus direction, a plane substantially perpendicular to the main axis of the flexible printed wiring board bends, and when it is largely rotated in the tracking direction, a plane almost parallel to the main axis of the flexible printed wiring board is bent. Since the flexible printed wiring board is flexed, the deformation resistance of the flexible printed wiring board is suppressed to an extremely small value, so that the operation of the moving and rotating member is less affected, and the control operation of the moving and rotating member can be stably performed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an optical disk device according to an embodiment of the present invention.

FIG. 2A is a plan view for explaining the same operation, and FIG. 2B is a plan view for explaining the same operation.

3A is a side view for explaining the same operation, FIG. 3B is a side view for explaining the same operation, and FIG. 3C is a side view for explaining the same operation.

FIG. 4 is an exploded perspective view of a conventional optical disc device.

[Explanation of symbols]

 1 Optical Disc Board 2 Hollow Shaft (Spindle) 3 Base 4 Moving Rotating Member 9 Tracking Drive Coil 10 Focus Drive Coil 11 Flexible Printed Wiring Board 12 Power Supply Supporting Stand

Front page continuation (72) Inventor Shingo Sakata 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

Claim: What is claimed is: 1. A base for holding a main shaft, and a moving and rotating member supported by the main shaft and held so as to be movable in the axial direction of the main shaft and rotatable about the main shaft. A focus drive coil attached to the moving and rotating member for moving the moving and rotating member; a tracking drive coil attached to the moving and rotating member for rotating the moving and rotating member; A flexible printed wiring board that supplies power to at least one of the tracking drive coils and a base that is held by the base and supports the flexible printed wiring board are provided, and the flexible printed wiring board serves as the spindle. An optical disk device having a curved surface and a curved surface, each of which has a substantially parallel surface and a surface substantially perpendicular to the main axis.